Icon in combobox?

I’m trying to put an icon in a combobox next to a text selection (it’s a select your country with a flag and country name).

I’ve searched all over google for cellrenderer, combobox, etc. and haven’t found any example of how to do this that works…

Ideally, I’d like to be able to populate the images via xml, but I think they need to be instances in the library…

Anyone done this??

TIA